As far as 12-year-old Toby Tallis is concerned, spells, magic and witches are definitely, definitely not his thing. So when his autistic sister, Shaz, persuades him to help investigate an 'enchanted' castle she's found, he agrees, hoping to prove there's no such thing. But once inside, the weird strangeness of the place makes them want to leave. Quickly! Unfortunately, they do so through different doors... ... and from then on, their lives are never quite the same again...